The Baihetan Arch Dam foundation system finite element model was established

in which contraction joints

dam foundation interface and foundation potential sliding blocks were simulated

and the viscoelastic artificial boundary was adopted to absorb out-propagating wave energy.A series of calculations were completed by the overloading and shear strength reduction method.Based on comprehensively analyzing dam foundation system residual displacements

dam-foundation interface opening range and its influence on grout curtain as well as the relationship between the residual displacements and overloading factor or strength reduction factor

it can be concluded that Baihetan Arch Dam′s overloading safety factor is approximately 2.0（compared with design earthquake）and the strength reserve coefficient is approximately 2.0.The conclusion shows that Baihetan Arch Dam meets the demand for design and checking earthquake and has some overloading ability.